1688545353181 has 2 divisors, whose sum is σ = 1688545353182. Its totient is φ = 1688545353180.

The previous prime is 1688545353167. The next prime is 1688545353221. The reversal of 1688545353181 is 1813535458861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1674200500281 + 14344852900 = 1293909^2 + 119770^2 .

It is a cyclic number.

It is not a de Polignac number, because 1688545353181 - 2⁵ = 1688545353149 is a prime.

It is a super-2 number, since 2×1688545353181² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1688545353581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844272676590 + 844272676591.

It is an arithmetic number, because the mean of its divisors is an integer number (844272676591).

Almost surely, 2^{1688545353181} is an apocalyptic number.

It is an amenable number.

1688545353181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688545353181 is an equidigital number, since it uses as much as digits as its factorization.

1688545353181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824000, while the sum is 58.

The spelling of 1688545353181 in words is "one trillion, six hundred eighty-eight billion, five hundred forty-five million, three hundred fifty-three thousand, one hundred eighty-one".